package com.authine.cloudpivot.ext.utils;

import org.apache.commons.lang.StringUtils;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

/**
 * @Author hxd
 * @Date 2022/3/17 10:40
 * @Description
 **/
public class MyAESUtil {

    // 加密
    public static String Encrypt(String sSrc, String sKey) throws Exception {
        sKey = validKey(sKey);

        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。
    }

    private static String validKey(String sKey) {
        if (sKey == null) {
            throw new RuntimeException("密钥为空");
        }

        if (sKey.length() != 16) {
            sKey = StringUtils.rightPad(sKey, 16, "0");
        }
        return sKey;
    }

    // 解密
    public static String Decrypt(String sSrc, String sKey) throws Exception {
        sKey = validKey(sKey);
        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec);
        byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
        try {
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original,"utf-8");
            return originalString;
        } catch (Exception e) {
            System.out.println(e.toString());
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        /*
         * 此处使用AES-128-ECB加密模式，key需要为16位。
         */
        String cKey = "qsyri";
        // 需要加密的字串
        String cSrc = "011500002922";
        System.out.println(cSrc);
        // 加密
        String enString = MyAESUtil.Encrypt(cSrc, cKey);
        System.out.println("加密后的字串是：" + enString);

        // 解密
        String DeString = MyAESUtil.Decrypt(enString, cKey);
        System.out.println("解密后的字串是：" + DeString);
    }
}